Engine displacement is an important specification for motorcycles because it gives an indication of the engine's power and performance. Generally speaking, larger displacement engines produce more power than smaller displacement engines, all other factors being equal. However, engine displacement is just one of many factors that affect engine power, so it is not always the best indicator of performance.
Other factors that affect engine power include the number of cylinders, the bore and stroke of the engine, the compression ratio, and the type of fuel used. For example, a four-cylinder engine will typically produce more power than a two-cylinder engine, and an engine with a larger bore and stroke will typically produce more power than an engine with a smaller bore and stroke.
Therefore, the numbers "2600 cm" on the side of a Yamaha V Star engine indicate that the engine has a displacement of 2600 cubic centimeters, which is relatively large for a motorcycle engine. This suggests that the engine is capable of producing a significant amount of power and performance.
